Abstract
The large values of the Transverse Single Spin Asymmetry, AN, seen in forward π0 production from polarized proton collisions have stimulated important questions and have been studied in many QCD based transverse spin models. Previously, STAR has reported large AN for forward π0 production in the kinematic region where the cross-section is well described by pQCD. More recently, STAR reported the first RHIC measurement of AN for forward η-meson production. The current analysis suggests that in this kinematic region, the η-meson asymmetry is larger than the already large π0 asymmetry. Continued upgrades to the STAR forward calorimetry, leading to the commissioning of Forward Meson Spectrometer in 2008, provides STAR with greatly improved electromagnetic coverage, and opens up exciting future possibilities for the transverse spin program.
Published Version
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